Heat screen



'Dec. 2, 1947. H, D STERlCK ETAL 2,432,047

' HEATSCREEN Filed Sept. 8, 1945 3 Sheets-Sheet 1 rrvmsrs Dec. 2, 1947.H. D. sTERlcK ETAL 2,432,047

HEAT S CREEN Filed Sept. 8, 1943 3 sheetsi-Sheet 2 lNvEN-roRs Harrison27. Stendc Leslie QStriL-Jd and 57 mvwaw HTTORNEYS Dec. 2, 1947. H. D.s'rERlcK ETAL 2,432,047

HEAT SCREEN v Filed Sept. '8. 1945 3 Sheets-Sheet 3 jig-7248 I .5s

FF .15. lg. 51

l INVENTOR S Hazrsbn l? St erick .Leslie GSITiCkZand,

HTTDRA/Eys Patented Dec. 2, 1947 UNITED STATES PATENT OFFICE HEAT SCREENHarrison D. Sterick and Leslie C. Strickland, Pittsburgh, Pa.

Application September 8, 1943, Serial No. 501,554 16 Claims. (Cl.160-179) Our invention relates to heat screens, and particularly to heatscreens that do not greatly interfere with vision therethrough.

Heretofore heat screens have been made of various elements, such aschains and cables. While such screens are somewhat effective, they areheavy, do not greatly aiect the flow of heat therethrough and when theyget heated up their `eiliciency as a heat screen greatly declines.Moreover they are usually heavy and fairly expensive and are not suitedto be freely moved from place to place.

The screens made according to our invention are light, inexpensive andcause the heat to be deflected so that the operator or object isprotected, and furthermore the screen is of such character thatobservation of an operation or process therethrough is not materiallyaffected.

In accordance with our` invention the preferred screen has as itsprincipal element one that has a plurality of closely spaced transverseslits that form a row of very narrow ribbon-like ns or prickles. Theslits extend only part way across the strip so that the ns areintegrally connected to the strip by a portion which extends therealong.The iins conduct heat from the unslit portion and provide a much largerarea of radiating surface than does an uncut strip. We also contemplatethe use of perforated sheets and also expanded metal as screen elements.

The elements are made use of in various forms of screens which are suchas to cause the heat to be deflected along the screen and this actiondeflects much of the heat from a person or thing to be protected.

In the drawings, which represent the present preferred embodiments ofour invention,

Fig. 1 is a plan view of one form of our screen clement;

Fig. 2 is a view in perspective of one shape of the louvers in saidelement;

Fig. 2a is a view in perspective of another shape of the louvers;

Fig. 2b is a View in perspective of still another shape of the louvers;

Fig. 3 is a plan view of another form of our screen element;

Fig. 4 is a view in elevation of a heat screen embodying the screenelement shown in Fig. 1;

Fig. 5 is an end view of the heat screen shown in Fig. 4;

Fig. 6 is a section View along the line VI-VI of Fig. 4;

Fig. 7 is a plan view of a heat screen in position around an ingot mold;

Fig. 8 is a section view along the line VIII-VIII of Fig. '7;

Fig. 9 is a plan view of a corner of the screen shown in Fig. 7 but to alarger scale;

Fig. l0 is a view in elevation of another form of heat screen, suitablefor use on the top of an ingot mold;

Fig. 11 is a top plan view of the screen sho-Wn in Fig. 10;

Fig. 12 is a view of another form of heat screen, shown in place aroundan ingot mold;

Fig. 13 is a view in elevation of the screen shown in Fig. 12;

Fig. 14 is a view in elevation of another type of heat screen;

Fig. 15 is an end view of the screen shown in Fig. 14;

Fig. 16 is a top plan view of still another form of ingot screen;

Fig. 17 is a view in elevation of the screen shown in Fig. 16;

Fig. 18 is a plan view of another form of screen element;

Fig. 19 is a plan view of still another form of screen element; and

Fig. 20 is a plan view of still another form of screen element.

In Fig. 1 of the drawing we have shown a typical screen element I 0,consisting of a rectangular strip I I of metal such as steel or copperof any convenient length having rows of substantially parallel closelyspaced cuts or slits I2 that extend inwardly from the opposite sideedges of the strip at right angles to the strip edge and terminate atsuch points as to leave a solid strip or body portion I3, relativelynarrow, which extends lengthwise of the strip along its center. Theportions of the strip between the slits form a plurality of very narrowribbon-like ns or louvers I4 which are connected at their inner ends tothe body portion I3. The ns I4 may be made to assume various forms, forexample, they may be rectangular; they may be crinkled longitudinally soas to have a concave portion I4a as shown in Fig. 2; they may have twoconcave portions I4b with a rib I4c in between as shown in Fig. 2a; orthey may have an S cross-section Md as shown in Fig. 2b. Sections suchas shown in Fig. 2, Fig. 2a and Fig. 2b tend to provide somewhat stifferns than at fins of rectangular section. A convenient size of strip is 8"wide, of V16 material having slits 1/8 of an inch apart and a centralbody portion about 3A" wide. It is to be observed that no metal isremoved in slitting 3 the metal strip, but that the fins are forced outof the normal plane (see Fig. 9).

In Fig. 3, the fins l5 form an angle with the side edge of the strip. Inthis figure the body portion i6 has openings Il each with a projectingportion or lip I8. It is to be understood that such openings could alsobe formed in body portion I3 of the strip shown in Fig. 1. It is alsoapparent that the cross section of the fins I5 'can bejrecjtangular, orotherwise, as for example those shown in Figs. 2, 2a, and 2b.

In Fig. 4 we show a heat screen which may be usefully employed to screenan operator from va source of heat such as a furnace ladle or the opendoor of a heating furnace. Thescreen corm prises a frame I9, which isformed from ani inverted U-shaped piece of` pipe in the inner braced bythe triangular plat-es 22. Slidably received in the groove 211;isa-screen 24 including vertical strips 25 of screen element, like theelement 1 0 shown in Fig. 1. It is to be understood that the screenelements-can be alsofarranged horizontally or at an angle' tol thehorizontal. The strips are secured, at the ends o fthe body portions i3to an edge strip or sash 25 of metal which extend around thel four sidesof the 'screen and is slidably received in the groove 20.1 Bolts 26 and27 are threadedthroughtheframe I9 and support the loweredge of; theedge;strip` 25,'. The screen can be readilyl removedj orreplaced bywithdrawal of the bolts 26 and 21,.; It isllalso within ourcontemplation to; make each screen element l0 detachable so thatthey-could be readily replaced incasegof injury to. the. element.

One of the important uses of the screen element IU- isin theconstruction of a mold screen 28 illustrated in Figs. 'l and 8.The-screen. consists of a frame-ZS-of such a; size esto enclose a mold30 and leave a space of severalinchesysay 3, between the screen and theingot mold sides. The frame which is slightly higher than. vthe mold.includes uprights 3l off angleriron or other suitable section, topbraces 32, side;liraoesfg?.3 V and. bottom braces 34. all oflang-leironf or other convenient section, all secured together; as byweld;`

ing. Lifting eyes are, secured midway' of the sidesof the top brace32.The'sldes of the frame 29 are 'formed byy vertical strips-I 0r of' thescreen;

elements, such as4 shown inFig. 1 or Fig. 2, preferably arranged.vertically. They couldbe honii zontal or at an angle to theyertical.,The ends', of the 'nsadjoinor VslightlyV overlap; as shown, in Fig. 9. Ascreen of `this character canad;-V Vantageously be usedto surround aningot moldA and causes the heat from, the hotV moldto flow-l upwardlyalong the spaces between the moldl wall and the screen. This heat -flowkeeps the topl portion of the mold and its contents hot for a longerperiod, than where a screen is not,v used,4

thus reducingv piping and segregation. of thespaced. apart by spacers 42through whichpasses 1 -subjected to the blast.

to be shielded from the heatof a furnace.

4 the bolts 43, which bolts pass through appropriate openings in thescreen layers and through the bottom and top frames. Each corner of thebottom and top frames are joined by corner pieces 44, conveniently madefrom angle iron. A lifting eye 45 is fastened to the top frame. Thedimensions of the top screen are such that the brace members 4I rest onthe top of the ingot mold walls and the screen extends beyond each endwall.

In Figs. 12 and 13 there is shown an ingot mold screen 46 which. ishinged so as to be opened or closed to surround a space around an ingotmold 41 (shown in broken lines). The mold screen consists of twoportions, each portion including a side screen 48 and an end screen 49.Each screen includes uprights 59 of angle iron, a top Ybrace 5! of strapiron, a center brace 52 of strapiron and a bottom brace 53 of strapiron. The sides and ends are covered With adjoining strips of screenelement 54, like that shown in Fig. 1 ory 3. Each of the portions arehinged at 55, 56 and 51 and are secured by fasteners 58, 59 and 69 atthe opposite corners. This form of mold screen is Wrapped around theingotl mold, while the form shown in Figs. 8 and 9- are vdropped downover the ingot mold. The effect of each when in position is the same.

Inl Figs. 14 and 15, We have shown a screen which includes ay U-shapedframe 6| mounted ona'pedestal'BZ, a screen element 63 and a guard`element 64, each received in the frame, both elements preferably beingslidably received. The screen 63, the rear one in Fig. 14, is made fromstrips of screen element such as shown in Fig. 1 or Fig. 3` joined-to asash or anedging 65 which is .slida-bly received in the frame 6-Iandsecured by bolts-66.` The other screen cr guard 64- is spaced fromthel screen 63` and is made of expanded metal-'or Woven wire, secured toan edgingV 611- slidably received in frame 6| and secured by bolts 68; iThis kind of screen screens` an` observer from. most of the heat from asource, suchv as a furnace-or pouring ladle beyond the sore-en. andprotects the observer from flying particles of metal, and Vat the sametime does not greatly interfere with the operators view of the heatsource.

In Figs. 16 and 17, we have shown diagrammatically a mold screen 69large enough to surround two ingots 10 and yH placed on a car "12. Thescreen includes a frame 13. similar to frame 28 (Figs. 7 and, 8) and thescreen elements 14 are like theA screen elements in Fig. 1l -or Fig. 3.It is evident that a similar frame can be arranged so as to enclose anynumber of ingots. This screen, as Well` as. the ingot screens heretoforedescribed, not. onlyl aid in a better solidication of an ingot, but alsoprotect it from adverse atmospheric currents when standing or passingthrough an ingot yard which is usually open. Not infrequently a verycold blastv may be directed against one or more sides of theA coolingingot and mold while the other sides are -not This, results in'Y unevencooling and undesira'bly effects the solidifying ingot. The screen wehave described greatly minimizes such effects.

limited.

Screens such as shown in Figs. 4 and jand;

Figs. 14 and 15 are useful Where operatorsl are In:

such instances, the screen may be large enough or enough screensprovided to screen a desired part of the walls. The screens may rest onthe ground or may be suspended from or hinged to the furnace or from anyother convenient support.

In Fig. 18 we have shown another suitable screen element l5. The element'I5 is made from a strip olf relatively thin metal and has narrow edgeportions I6 and 1l, a top portion '18, a bottom end portion not shown,and a center portion 1B. The portions between the edges and centerportion are slitted to form fins 80. The pins are offset from the planeof the strip.

In Fig. 19, we have shown a screen element 8i which is similar to theone shown in Fig. 18, but without the center portion.

In Fig. 2G, we have shown a screen E32 of pei'- forated metal havingnarrow cut out slots 83 spaced apart. When an element of this characteror a screen of ordinary fine rneshed expanded metal is employed, thesheet `may be of any desired practical dimensions.

It is understood that in practice the screen fins do not lie in a flatplane, but each alternate one except where it joins the center portionor body portion is above or below the plane of the strip and forms asmall angle therewith. Thus it is possible for light rays to travelthrough the element.

It is apparent that the hot top shown in Fig. ll can be protected, topand bottom, by expanded metal or metal mesh such as we have shown anddescribed in Fig. 14. It is also apparent that the mesh protectingscreen 64 can be placed on both sides of a screen similar to that shownin Fig. 14.

The strip elements l!! such as are used in the various screens, can beso attached to the frame in such manner that any element can be readilyreplaced.

It appears that the prlckled elements change radiant heat to conductedheat, and this may explain the eiciency of the screen in general andparticularly where the screen element is incorporated in an ingot mold.

While We have described certain presently preferred embodiments of ourinvention, it is to be understood that the invention may be otherwiseembodied within the scope of the following claims.

We claim:

1. A substantially planiform heat screen including a frame, and a screenelement attached to said frame, said screen element including a bodyportion extending lengthwise thereof, and a plurality of closely spacedsubstantially parallel strips forming slits one end of each of saidstrips terminating at the body portion integrally therewith.

2. A heat screen including a frame, a plurality of substantiallyplaniforrn screen elements attafhed to the frame, said screen elementseach including a body portion extending lengthwise thereof. and aplurality of closely spaced substantially parallel strips forming slitsone end of each of said strips terminating at the body portion.

3. A heat screen including a frame, a plurality of substantiallyplaniform screen elements attached to the frame, said screen elementseach including a body portion extending lengthwise thereof, and aplurality of closely spaced substantially parallel strips forming slitsone end of each of said strips terminating at the body portion, theedges of adjoining screen elements being in contact.

4. A heat screen including a frame, and a iat 6- strip like screenelement attached to said frame, said screen element-including acentrally disposed narrow body portion extending lengthwise thereof, anda plurality of closely spaced substantially parallel strips formingslits one end of each of said strips terminating at the narrow bodyportion.

5. A heat screen including a frame, and a flat strip-like screenelement, said screen element including a central body portion extendinglengthwisethereof, and a plurality of strips extending from the bodyportion to the edges of said element forming a series of fins, said nsbeing' inclined at an angle to the body portion and having interveningslits.

6. A heat screen including a frame, and a flat strip-like screenelement, said screen element including a central body portion extendinglengthwise thereof, and a plurality of strips extending from the bodyportion to the edges of said element forming a series of ns, the finsbeing crinkled longitudinally.

'l'. A heat screen comprising a frame having a slot therein, and 9, sashslidably received in the slot, screen elements attached to the sash,said elements each including a centrally disposed body portion,extending lengthwise thereof and a plurality of closely spacedsubstantially parallel strips forming slits one end of each of saidstrips terminating at the body portion, said screen elements beingmounted in the sash with the edges of adjacent elements in contact.

8. A heat screen for enclosing a heated object said screen comprising aframe surrounding and spaced from the object said frame having screenelements attached thereto and said elements each including a narrow bodyportion of thin material, extending lengthwise thereof, and a pluralityof narrow iins integrally attached to the body portion.

9, A heat screen for enclosing a heated object said screen comprising aframe having a plurality of sides, certain of said sides being hingedlysecured to an adjacent side, and spaced from the sides of the object tobe enclosed, said frame having screen elements attached thereto, saidelements each including a narrow body portion of thin material extendinglengthwise thereof, and a plurality of narrow ns integrally attached tothe body portion.

10. A heat screen including a frame, and a screen element attached tosaid frame, said screen element including a centrally disposed bodyportion extending lengthwise thereof, a plurality of closely spacedsubstantially parallel strips forming slits one end of each of saidstrips terminating at the body portion, said body portion having spacedopenings therein.

11. A heat screen including a frame, and a screen element attached tosaid frame, said screen element including a centrally disposed bodyportion extending lengthwise thereof, a, plurality of closely spacedsubstantially parallel strips forming slits one end of each of saidstrips terminating at the body portion, said body portion having spacedopenings therein, and lips adjoining said openings.

12. A heat screen comprising a frame, a plurality of screen elementsattached to the frame, and forming a substantially plane surface, saidelements each including a body portion extending lengthwise thereof, aplurality of narrow fins attached to said body portion, and a guardelement spaced apart from the screen element and sub- T stantiall-s'.ileil11a'1le1-v thereto@ both elements.: beine.;

slidably A reoevedf in l thearflalme.

13 A heat; screen. including; el plurel'ityY of: layers. e1Screeoelementssde; bysida; each screen.

smeert apart; layer-sj.` each-- layer including screenA mexleogthwiseorthe elementsrand aplurality4 element comprising a., narrow-body,portion-and-v Q1, ofl narrow ns, integrally attached: to` the.y bodynarrovtv elongated finsL integrally connected thereto, and a frame forholding said laybersirrl spaced apart. parallel relationship.

14 A, heat screen. including a., frame, screen elements, attached to theframe, said screen, ele mentsn includingv` a, centrally di-sposed--,body,4 portion,` a. plurality of, velfy` narrow ribbonflike nsattachedto said body portionfand extend-ing outwardly atleastsome-ofsadfms, lying, Outside the normal plane of the body portion-l.

1,5. A-.heat screen, forenclosingj amingot mold, saidscreen oomprsin gaI frame surrounding. and spaced, from the sides ofthe mold, saidfrarnehaying, screen elementsattached thereto, saidr elements including,aoentrally .disposed body` nor--V tonof thin material extending.lengthwise of the element, and a plurality af-narrow, ribbon-like ns;extendingV from the-.body portion.

16., A. heat. screen` includingl a plurality. of

DQIQLL.,

HARRISOND. STERIGK., LESLIEEC. STRICKLANQ.

REEERENQES. (l-TED.'-

The following references arent recordfin the le of1 this patent:`

UNITED STATES PA'I'ENTS 1,52- Number Name Date 1,487,794 Melaun- Mar.25', 1924` 936,183 Stein Oct. 5, 1909 2,162,562 Moore' June 13,1939969,644- Matheson Sept. 6, 1910 Z9 600,904 Beall Mar. 22, 1898v 275,223Langtry- Apr. 3, 1883 647,891 Stover Apr. 17, 1900 2,246,602 SchultzJuney 24, 1941

